06-15-2011 03:20 PM - edited 03-01-2019 05:27 PM
We've found that we have to set static link local IPs when two routers might peer over multiple VLAN interfaces.
The issue is that the routers, 6500s with sup720s, utilize the same autoconfig'd link local address on each VLAN interface. EIGRP IPv6 refuses to peer with the other router on multple VLANs when the link local are the same.
Anyone else encounter this? Did we miss a config option that would force unique link locals on different VLANs interfaces?
Because of this issue, we've made it our best practice to configure static link local for all inter-router transits.
06-15-2011 10:36 PM
HI Gary,
I had a setup with SU720 on 2 7600s and I am able to enable the neighborship without any issues. I didnt configure static link local as below,
Ryanair#show ipv6 int vlan 500 | inc FE
IPv6 is enabled, link-local address is FE80::21C:B0FF:FEB5:6D00
Ryanair#sho ipv6 int vlan 501 | inc FE
IPv6 is enabled, link-local address is FE80::21C:B0FF:FEB5:6D00
Ryanair#show ipv6 eigrp nei
EIGRP-IPv6 neighbors for process 100
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
1 Link-local address: Vl501 11 00:15:51 816 4896 0 13
FE80::222:55FF:FE17:25C0
0 Link-local address: Vl500 11 00:17:14 1 200 0 12
FE80::222:55FF:FE17:25C0
Ryanair#
Can you let us know the version on oth the devices?.
Regards,
Nagendra
06-16-2011 07:47 AM
Try this with staticly configured neighbors.
ipv6 router eigrp 2
neighbor FE80:blah:blah:blah Vlan10
neighbor FE80:blah:blah:blah Vlan20
06-16-2011 08:11 AM
Hi,
Works fine with static neighbor as well..
Ryanair#show run | sec ipv6 router eigr
ipv6 router eigrp 100
eigrp neighbor FE80::222:55FF:FE17:25C0 Vlan500
eigrp neighbor FE80::222:55FF:FE17:25C0 Vlan501
no shutdown
Ryanair#show ipv6 eigrp neighbors
EIGRP-IPv6 neighbors for process 100
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
1 Link-local address: Vl501 14 00:02:40 1 200 0 23
FE80::222:55FF:FE17:25C0
0 Link-local address: Vl500 10 00:02:42 1 200 0 24
FE80::222:55FF:FE17:25C0
Ryanair#
I tried in 12.2(33)SRD4 and works fine. Please let me know what version are you trying.
Regards,
Nagendra
06-15-2011 11:46 PM
Hi,
I have had some of the same trouble when trying to route traffic between vlan-interfaces on the ASA5550 platform. If I got a vlan10 and a vlan11 with different link local addresses on each vlan interface, traffic will not pass. If i change the link local addresses so it is the same on both vlan10 and vlan11 traffic flows between those two interfaces, but something was unstable so my videocall dropped after a while. Don't know why, if it is the IPv6 static routing-support on ASA5500 running v8.4(1) is poor on this release? The ASA doesn't have full IPv6-support compared to Cisco IOS on routers.
Anyone who has any knowledge about this?
BR
Jesper
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